Anode material for lithium-ion battery and preparation method

A technology of lithium ion battery and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of low specific capacity of lithium titanate, and achieve the effect of increasing reversible specific capacity, expanding diffusion channels, and mild conditions

Active Publication Date: 2012-10-03
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, the specific capacity of lithium titanate is too low, and the potential plateau is as high as 1.5V (vsLi + / Li), these defects still prevent the development and application of such materials

Method used

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  • Anode material for lithium-ion battery and preparation method
  • Anode material for lithium-ion battery and preparation method

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Experimental program
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Effect test

Embodiment 1

[0020] Lithium-ion battery composite negative electrode material is composed of graphite and mesoporous carbon. The mass percentage of mesoporous carbon in the composite material is 2.5%; the degree of graphitization of graphite is 80%; the pore size distribution of mesoporous carbon is 2-50nm. The porosity is 92%; the D50 (particle diameter of 50% of the particles accumulated) of the composite material is 10.973 μm, and the D90 (particle size of 90% of the particles accumulated) is 23.892 μm.

[0021] The preparation method of above-mentioned composite negative electrode material is as follows:

[0022] Step 1: graphitize the coal tar pitch coke at 2100° C. for 2 hours to obtain graphite with a degree of graphitization of 80%.

[0023] The second step: the graphite obtained in the first step is pulverized by a crusher, classified, and air-flow milled to obtain fine graphite with a D50 of 4.331 μm.

[0024] The third step: uniformly mix fine graphite, phenolic resin (residual...

Embodiment 2

[0026] The lithium-ion battery composite negative electrode material is composed of graphite and mesoporous carbon, and the mass percentage of mesoporous carbon in the composite material is 3.9%; the degree of graphitization of graphite is 83%, and the through-porosity of mesoporous carbon is 93%; the composite material D50 is 7.881 μm, and D90 is 18.841 μm.

[0027] The preparation method of the above-mentioned carbon composite negative electrode material is as follows:

[0028] Step 1: graphitize the petroleum coke at 2400° C. for 4 hours to obtain graphite with a degree of graphitization of 83%.

[0029] The second step: the artificial graphite obtained in the first step is pulverized by a crusher, classified, and air-flow milled to obtain fine graphite with a D50 of 3.179 μm.

[0030] The third step: uniformly mix fine graphite, phenolic resin (40% carbon residue rate), and pore-forming additive F127 in 60ml of ethanol solvent according to the mass ratio of 99:10:5, and s...

Embodiment 3

[0032] Lithium-ion battery composite negative electrode material is composed of graphite and mesoporous carbon, and the mass percentage of mesoporous carbon in the composite material is 28.8%; the degree of graphitization of graphite is 87%, and the through-porosity of mesoporous carbon is 86%; the composite material D50 is 14.881 μm, and D90 is 28.841 μm.

[0033] The preparation method of the above-mentioned carbon composite negative electrode material is as follows:

[0034] Step 1: graphitize coal tar pitch coke at 2700° C. for 5 hours to obtain artificial graphite with a degree of graphitization of 87%.

[0035] The second step: the artificial graphite obtained in the first step is pulverized by a crusher, classified, and air-flow milled to obtain fine graphite with a D50 of 5.279 μm.

[0036] The third step: uniformly mix fine graphite, phenolic resin (40% carbon residue rate), and pore-forming additive P123 in 60ml of ethanol solvent according to the mass ratio of 99:1...

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Abstract

The invention provides an anode material for a lithium-ion battery and a preparation method thereof. The anode material is characterized in that the material is a composite of graphite and mesoporous carbons; the mesoporous carbons account for 1-60% of the composite by mass; the graphitization degree of the graphite ranges from 78% to 88%; the pore diameters of the mesoporous carbons are 2-50nm; and the through porosity is not lower than 85%. The carbon composite anode material is prepared by chemically compounding the graphite with low graphitization degree and the mesoporous carbons with high through porosity. The anode material is suitable for low-temperature power lithium-ion batteries, has mild preparation conditions and is beneficial to industrialization.

Description

technical field [0001] The invention relates to a battery electrode material and a preparation method thereof, in particular to a lithium battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are favored for their advantages such as large specific capacity, high working voltage, long cycle life, environmental friendliness, and no memory effect. They are the main energy storage devices for portable electronic products at present, and they are also ideal power sources for electric vehicles in the near future. . However, the high-rate electrochemical performance of currently commercialized lightweight lithium-ion batteries is generally poor, and it is difficult to meet the requirements of power batteries, especially at low temperatures (-20 to -40°C). The rapid charge and discharge performance of the battery is worse, so its electrode material must be modified. [0003] As far as the low-temperature power lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/133H01M4/1393C01B31/02C01B31/04
CPCY02E60/122Y02E60/10
Inventor 皮涛刘洪波何月德石磊
Owner HUNAN SHINZOOM TECH
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